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STI EJ207 MY01-MY04 Serial #4073647
OEM Factory Shortblock ('18-'21 STi/Type RA)
90 must be used with 3
Generate greater power levels while improving reliability
Front Oxygen Sensor EJ207 Twinscroll 12310AA410 STI EJ207 MY01-MY04 Serial #4073647This sensor measures the oxygen content in the exhaust system pre catalyst. An oxygen sensor (or AF sensor) can establish the air fuel ratio by measuring the excess oxygen left over from the combustion process. The front air fuel (AF) sensor is used by the ECU for fuel calculations during closed loop fueling. A faulty sensor can result in poor engine operation or stalling and may set a CEL. Manufacturer Part Nos.: 22641AA500 (MY08 14), 22641AA191
